Metal filing falling prevention fastening structure for flexible direct-current transformer and using method of metal filing falling prevention fastening structure

Abstract

The invention relates to a metal filing falling prevention fastening structure for a flexible direct-current transformer and a using method of the metal filing falling prevention fastening structure,and belongs to the technical field of transformers. According to the technical scheme, a nut (1), an unthreaded stud (3) and a threaded stud (5) are sequentially connected from top to bottom, a tool withdrawal limiter (2) is arranged between the nut (1) and the unthreaded stud (3), and two tool withdrawal grooves (4) are formed in the upper end and the lower end of the threaded stud (5) respectively; the unthreaded stud is correspondingly arranged at the position of an upper outlet (7) of a lead connection position, and the threaded stud is correspondingly arranged at the position of a threaded hole of a shielding tube flange (8) of a shielding tube (6). The advantages of the invention are that studs are divided into the unthreaded stud and the threaded stud, and during fastening, the threaded stud is effectively prevented from being in contact with the upper end of the connection position of a lead, therefore, a problem that metal filling fall off is solved, the reliability of the position of the internal lead is guaranteed, the structure is simple, the achievement is easy, and the effect is remarkable.

Description

technical field [0001] The invention relates to a metal chip-proof fastening structure for a flexible DC transformer and an application method thereof, belonging to the technical field of transformers. Background technique [0002] The connection position of the lead wire inside the flexible DC transformer mostly uses a bolt connection structure. Often when the lead wire is assembled, due to tolerance, process manufacturing, material characteristics and other reasons, the thread contacts the hole wall of the flange plate. When the bolt is tightened, it may Metal shavings will fall into the lead wire shielding tube, which is difficult to clean up. Metal shavings will generate partial discharge, which will bring safety hazards to the operation of flexible DC transformers. It even leads to failure of the flexible DC transformer test, burning out the flexible DC transformer, and causing huge economic losses. At present, there is no effective way to solve the problem of metal sh...

AI Technical Summary

Problems solved by technology

[0002] The connection position of the lead wire inside the flexible DC transformer mostly uses a bolt connection structure. Often when the lead wire is assembled, due to tolerance, process manufacturing, material characteristics and other reasons, the thread contacts the hole wall of the flange plate. When the bolt is tightened, it may Metal shavings will fall into the lead wire shielding tube, which is difficult to clean up. Metal shavings will generate partial discharge, which will bring safety hazards to the operation of flexible DC transformers

It may even lead to failure of the flexible DC transformer test, burning out the flexible DC transformer, and causing huge economic losses

At present, there is no effective way to solve the problem of metal shavings falling during fastening. Only the metal shavings can be cleaned, and the effect is difficult to guarantee

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